| plotloadings {PCAtools} | R Documentation |
Plot the component loadings for selected principal components / eigenvectors and label variables driving variation along these.
plotloadings(pcaobj,
components = getComponents(pcaobj, seq_len(5)),
rangeRetain = 0.05,
absolute = FALSE,
col = c('gold', 'white', 'royalblue'),
colMidpoint = 0,
shape = 21,
shapeSizeRange = c(10, 10),
legendPosition = 'top',
legendLabSize = 10,
legendIconSize = 3.0,
xlim = NULL,
ylim = NULL,
labSize = 2.0,
labhjust = 1.5,
labvjust = 0,
drawConnectors = TRUE,
positionConnectors = 'right',
widthConnectors = 0.5,
typeConnectors = 'closed',
endsConnectors = 'first',
lengthConnectors = unit(0.01, 'npc'),
colConnectors = 'grey50',
xlab = 'Principal component',
xlabAngle = 0,
xlabhjust = 0.5,
xlabvjust = 0.5,
ylab = 'Component loading',
ylabAngle = 0,
ylabhjust = 0.5,
ylabvjust = 0.5,
axisLabSize = 16,
title = '',
subtitle = '',
caption = '',
titleLabSize = 16,
subtitleLabSize = 12,
captionLabSize = 12,
hline = c(0),
hlineType = 'longdash',
hlineCol = 'black',
hlineWidth = 0.4,
vline = NULL,
vlineType = 'longdash',
vlineCol = 'black',
vlineWidth = 0.4,
gridlines.major = TRUE,
gridlines.minor = TRUE,
borderWidth = 0.8,
borderColour = 'black',
returnPlot = TRUE)
pcaobj |
Object of class 'pca' created by pca(). REQUIRED. |
components |
The principal components to be included in the plot. DEFAULT = getComponents(pcaobj, seq_len(5)). OPTIONAL. |
rangeRetain |
Cut-off value for retaining variables. The function will look across each specified principal component and retain the variables that fall within this top/bottom fraction of the loadings range. DEFAULT = 0.05. OPTIONAL. |
absolute |
Logical, indicating whether or not to plot absolute loadings. DEFAULT = FALSE. OPTIONAL. |
col |
Colours used for generation of fill gradient according to loadings values. Can be 2 or 3 colours. DEFAULT = c('gold', 'white', 'royalblue'). OPTIONAL. |
colMidpoint |
Mid-point (loading) for the colour range. DEFAULT = 0. OPTIONAL. |
shape |
Shape of the plotted points. DEFAULT = 21. OPTIONAL. |
shapeSizeRange |
Size range for the plotted points (min, max). DEFAULT = c(10, 10). OPTIONAL. |
legendPosition |
Position of legend ('top', 'bottom', 'left', 'right', 'none'). DEFAULT = 'top'. OPTIONAL. |
legendLabSize |
Size of plot legend text. DEFAULT = 10. OPTIONAL. |
legendIconSize |
Size of plot legend icons / symbols. DEFAULT = 3.0. OPTIONAL. |
xlim |
Limits of the x-axis. DEFAULT = NULL. OPTIONAL. |
ylim |
Limits of the y-axis. DEFAULT = NULL. OPTIONAL. |
labSize |
Size of labels. DEFAULT = 2.0. OPTIONAL. |
labhjust |
Horizontal adjustment of label. DEFAULT = 1.5. OPTIONAL. |
labvjust |
Vertical adjustment of label. DEFAULT = 0. OPTIONAL. |
drawConnectors |
Logical, indicating whether or not to connect plot labels to their corresponding points by line connectors. DEFAULT = TRUE. OPTIONAL. |
positionConnectors |
Position of the connectors and their labels with respect to the plotted points ('left', 'right'). DEFAULT = 'right'. OPTIONAL. |
widthConnectors |
Line width of connectors. DEFAULT = 0.5. OPTIONAL. |
typeConnectors |
Have the arrow head open or filled ('closed')? ('open', 'closed'). DEFAULT = 'closed'. OPTIONAL. |
endsConnectors |
Which end of connectors to draw arrow head? ('last', 'first', 'both'). DEFAULT = 'first'. OPTIONAL. |
lengthConnectors |
Length of the connectors. DEFAULT = unit(0.01, 'npc'). OPTIONAL |
colConnectors |
Line colour of connectors. DEFAULT = 'grey50'. OPTIONAL. |
xlab |
Label for x-axis. DEFAULT = 'Principal component'. OPTIONAL. |
xlabAngle |
Rotation angle of x-axis labels. DEFAULT = 0. OPTIONAL. |
xlabhjust |
Horizontal adjustment of x-axis labels. DEFAULT = 0.5. OPTIONAL. |
xlabvjust |
Vertical adjustment of x-axis labels. DEFAULT = 0.5. OPTIONAL. |
ylab |
Label for y-axis. DEFAULT = 'Component loading'. OPTIONAL. |
ylabAngle |
Rotation angle of y-axis labels. DEFAULT = 0. OPTIONAL. |
ylabhjust |
Horizontal adjustment of y-axis labels. DEFAULT = 0.5. OPTIONAL. |
ylabvjust |
Vertical adjustment of y-axis labels. DEFAULT = 0.5. OPTIONAL. |
axisLabSize |
Size of x- and y-axis labels. DEFAULT = 16. OPTIONAL. |
title |
Plot title. DEFAULT = ”. OPTIONAL. |
subtitle |
Plot subtitle. DEFAULT = ”. OPTIONAL. |
caption |
Plot caption. DEFAULT = ”. OPTIONAL. |
titleLabSize |
Size of plot title. DEFAULT = 16. OPTIONAL. |
subtitleLabSize |
Size of plot subtitle. DEFAULT = 12. OPTIONAL. |
captionLabSize |
Size of plot caption. DEFAULT = 12. OPTIONAL. |
hline |
Draw one or more horizontal lines passing through this/these values on y-axis. For single values, only a single numerical value is necessary. For multiple lines, pass these as a vector, e.g., c(60,90). DEFAULT = c(0). OPTIONAL. |
hlineType |
Line type for hline ('blank', 'solid', 'dashed', 'dotted', 'dotdash', 'longdash', 'twodash'). DEFAULT = 'longdash'. OPTIONAL. |
hlineCol |
Colour of hline. DEFAULT = 'black'. OPTIONAL. |
hlineWidth |
Width of hline. DEFAULT = 0.4. OPTIONAL. |
vline |
Draw one or more vertical lines passing through this/these values on x-axis. For single values, only a single numerical value is necessary. For multiple lines, pass these as a vector, e.g., c(60,90). DEFAULT = NULL. OPTIONAL. |
vlineType |
Line type for vline ('blank', 'solid', 'dashed', 'dotted', 'dotdash', 'longdash', 'twodash'). DEFAULT = 'longdash'. OPTIONAL. |
vlineCol |
Colour of vline. DEFAULT = 'black'. OPTIONAL. |
vlineWidth |
Width of vline. DEFAULT = 0.4. OPTIONAL. |
gridlines.major |
Logical, indicating whether or not to draw major gridlines. DEFAULT = TRUE. OPTIONAL. |
gridlines.minor |
Logical, indicating whether or not to draw minor gridlines. DEFAULT = TRUE. OPTIONAL. |
borderWidth |
Width of the border on the x and y axes. DEFAULT = 0.8. OPTIONAL. |
borderColour |
Colour of the border on the x and y axes. DEFAULT = 'black'. OPTIONAL. |
returnPlot |
Logical, indicating whether or not to return the plot object. DEFAULT = TRUE. OPTIONAL. |
A ggplot2 object.
Kevin Blighe <kevin@clinicalbioinformatics.co.uk>
options(scipen=10)
options(digits=6)
col <- 20
row <- 20000
mat1 <- matrix(
rexp(col*row, rate = 0.1),
ncol = col)
rownames(mat1) <- paste0('gene', 1:nrow(mat1))
colnames(mat1) <- paste0('sample', 1:ncol(mat1))
mat2 <- matrix(
rexp(col*row, rate = 0.1),
ncol = col)
rownames(mat2) <- paste0('gene', 1:nrow(mat2))
colnames(mat2) <- paste0('sample', (ncol(mat1)+1):(ncol(mat1)+ncol(mat2)))
mat <- cbind(mat1, mat2)
metadata <- data.frame(row.names = colnames(mat))
metadata$Group <- rep(NA, ncol(mat))
metadata$Group[seq(1,40,2)] <- 'A'
metadata$Group[seq(2,40,2)] <- 'B'
metadata$CRP <- sample.int(100, size=ncol(mat), replace=TRUE)
metadata$ESR <- sample.int(100, size=ncol(mat), replace=TRUE)
p <- pca(mat, metadata = metadata, removeVar = 0.1)
plotloadings(p, drawConnectors=TRUE)